REQUIREMENTS
First, you'll need to have the Index Dungeon unlocked. (duh) Set your caravan to around floor 15 or so then jump down the Mastery Dungeon and hope that your excavator has a dengeki ticket. Next, you'll need the following items:
Silk Hat - use this ONLY when you've cloned 10 zombies already. Unequip it when fusing to avoid COND decrease. Might want to bring extras just in case.
Curse Band - use this in the first few floors to slip past enemies while looking for the proper grind area.
Gas Mask - once you're done grinding, this will protect you from poison fields left by the snake ladies.
Bring a couple of meats, a few potions and 1 or 2 weapons as well. I'll leave the facilities up to you.
PREPARATION
Have the cape and Curse Band equipped. The zombies start appearing on the 2nd floor, so rush through the enemies (curse band helps) and find the stairs. On the 2nd floor, you'll want to find an area that resembles this diagram:
Q Q Q Q Q Q
Q Q Q < Q Q
Q Q Q Q Q Q
Q Q Q Q Q Q
Q = = = = = =
Q - free space
< - mirror facing left
= - clear straight path exitting the area (preferably towards the stairs)
This is just a recommendation. The most important thing is to have at least 2 free walkable spaces all around the mirror. If you can't find one, head to the next floor. Just hope that you find one early since zombies disappear in the later floors. I suggest backing up your savefile before entering the dungeon just in case you don't get the proper area. When you have it, find a random zombie and carry it in. Next is the cloning method:
CLONING to 10
You'll want to clone until you have a total of 10 zombies. I know 15 is the best amount since you'll be attacking infinitely but you'll have a very hard time fusing the zombies properly. Though 11 works just fine, 10 is foolproof especially when the zombies don't cooperate. Here's your diagram:
X Q T Q Q Q
X D M < Q Q
X B H K Q Q
X Q Q Q Q Q
X = = = = = =
Q - free space
< - mirror facing left
= - exit path
IMPORTANT: make sure you can consistently OHKO a zombie before you start cloning. The best way to know when you're ready is if you can OHKO them naked. (no equips)
1. Position yourself at point H then throw the zombie on point K, which is right next to the mirror's side.
2. Lift the zombie from point K, throw it onto point T. Without leaving point H, wait for the zombie to walk toward you to point M.
3. On point M, the mirror will duplicate it, creating a zombie on point D. Lift the zombie at point M and throw it onto point K. Kill it.
4. By now, the duplicated zombie would've either moved to point M or B. In any case, lift and throw it onto point K then kill it.
5. Stay at point H and attack the air for a while until a zombie revives facing AWAY from you, then move to point B.
6. Walk along row X for 15 turns. Now you've reset the other zombie's revive cycles, allowing them to revive one after the other.
7. Move back to point H and kill zombies until the last one revives.
8. Repeat steps 2-7 until you have a total of 10 zombies on point K.
It's important to walk for 15 turns outside of a
newly revived zombie's view to reset all of the zombies' revive cycles. This will make sure that there are no gaps inbetween zombie revives. You can also take this time to grab items and such. Holding O speeds up the movement and prevents item pick-ups. This is nifty for walking around the floor littered with stuff.
Assuming you can OHKO each zombie, you will have 5 free turns after each 10 zombie interval. Don't forget to use Unlosing LDF whenever possible, but make sure you use it during the 5 free turns
FUSING
This part needs a little experimentation depending on how good your stats are. My method fuses 2 zombies of the same level, thus doubling their level and boosting their stats by quite alot. To have a rough idea on when you should start fusing, you should first be able to OHKO zombies for more than 3 times their HP with a 0% cond weapon. Now for the fusing process:
X Q T Q Q Q
X D M < Q Q
X B H K Q Q
X Q Q Q Q Q
X = = = = = =
Q - free space
< - mirror facing left
= - exit path
1. You have 10 zombies on point K. After the 5 free turns, kill zombie#1 to 9.
2. When zombie#10 revives, lift and throw it onto point M to duplicate it. After the zombie's turn, it will fuse.
3. Lift the newly fused zombie at point M and toss it onto point K. Kill it.
4. You will have 1 free turn before zombie#1 revives.
5. Kill zombies until one of them revives facing away from you, then move back to point B and walk across row X for 15 turns to reset all the zombies' revive cycles. Now you'll need to "prepare" the next zombie to fuse by making him zombie#10
6. Using the Menu->Enemies option, find a zombie that hasn't been fused yet, and kill it. (i.e. 5 zombies are lv10 while 5 are lv5. Kill a lv5 one) If the NEXT zombie revives facing away from you, then proceed to the next step. If not, repeat this entire step.
7. You've killed a non-fused zombie, and the next one in line is facing away from you. Move back to point B then walk along row X for 15 turns. Since you reset the cycle, the current zombie standing becomes #1, while the non-fused one that you killed earlier became #10.
8. Repeat steps 1-7 until you've fused all non-fused zombies and equalized their levels.
If you suddenly can't OHKO the newly-fused zombie, STOP fusing! Equip a Curse Hand (you'll see alot of them around you) to boost your SAT and take off your Silk Hat while you're at it. Resume fusing ONLY after you can OHKO consistently. (again, with a 0% COND weapon to be sure)
FINISHING UP (and some notes)
Early on, the levels are a bit slow going at about 2 levels per 10 kills. Later on though the exp gain from zombies grows substantially. As an example, I was getting 3-4 levels per 10 kills at lv600+ fighting against lv480 zombies. Once you reach the desired level, wait for a zombie to revive facing away from you then take the exit. Wear your Gas Mask so that the poison fields won't wittle your ungodly HP down. Take the caravan exit or simply clear the dungeon to get your total levels.
btw, whenever i say "walk along row X", i simply mean walk on spaces
outside of the (faced away) zombie's view range. Some layouts won't have an entire row 2 spaces behind you so i thought i'd point that out.
Hope this helps.
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Das Speichern finde ich ein bishen nervig, da man wenn man verliert und sein Spielstand lädt um sein Fehler zu korigieren wieder lvl 1 ist xDD So wollen die wahrscheinlich das zu weit hochleveln verhindern 
Der skill war jetzt erfunden aber so ähnlich ist es 
